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EMERALD K3, K6 & M3D ECUs (RS232 / Serial)


  • Emerald M3D
  • Emerald k3
  • Emerald K6


The Emerald K3, K6, and M3D ECUs output data at 19200bps.


Please note that on the Emerald the serial connections are NOT ON STANDARD PINS, the Emerald ECU uses pins 8 and 9. Race Technology understand that EMERALD supply a cable that switch over these pins with the ECU, if you are unable to locate this lead then please contact Emerald for a replacement.

Pin Number Connection Comments
1 CAN_H CAN bus interface
2 CAN_L CAN bus interface
3 - Not used
4 - Not used
5 earth Signal earth
6 - Not Used
7 Rx RS232 serial interface, data receive
8 Tx RS232 serial interface, data transmit
9 CTS RS232 serial interface, clear to send

Data Channel Listing

When connected to the Race Technology ECU Serial Interface, the following channels are decoded:

ECU Message Name Race Technology Data Channel Resolution of Data
Engine Speed RPM (Engine) 25 RPM
Throttle position Throttle position (aux 1) 0.1%
Manifold pressure Boost pressure (pressure 5) 0.1 kPa
Ambient Air Pressure Ambient air pressure (pressure 1) 0.1 kPa
Ignition advance Ignition angle (angle 2) 0.1o BTDC
Air Fuel Ratio Lambda 1 (misc 1) 0.01 lambda
Air Fuel Ratio target Lambda 2 (misc 2) 0.01 lambda
Battery voltage Battery voltage (misc 3) 0.01 V
Primary Ing Time Fuel inj 1 PW on (measured time 1) µs
Secondary Inj Time Fuel inj 2 PW on (measured time 2) µs
Coil on Time Coil 1 PW (measured time 9) µs
Air Temperature Ambient air temp (temperature 1) 0.1 oC
Coolant Temperature Coolant temp (temperature 8) 0.1 oC
Aux Temperature Aux 1 (temperature 25) 0.1 oC
Exhaust Gas Temp Exhaust 1 temp (temperature 17) 0.1 oC

Not all channels listed in the table above may be available from your ECU. The available data channels vary with the vehicle model, year of manufacture & connected sensors.

Page last modified on February 02, 2021, at 05:21 PM